ground silver steel round bar

[sean logieParticipant @seanlogie69385]

[sean logieParticipant @seanlogie69385]

How accurate would this be or would it depend on supplier . I'm planing on making some dowel pins for locating two parts  .

 

Thanks

Sean

Edited By sean logie on 18/11/2018 08:38:01

[EmgeeParticipant @emgee]

Hi Sean, dowel pins are normally dead to size so probably the best route.

Emgee

[Tony Pratt 1Participant @tonypratt1]

Sean,

Yes seems to depend on supplier, quick Google search of 2 suppliers quote different size tolerance I would use dowel pins.

Tony

[Michael GilliganParticipant @michaelgilligan61133]

This is probably as good as it gets: **LINK**

http://www.silver-steel.co.uk/aboutsilversteel.php

MichaelG.

[sean logieParticipant @seanlogie69385]

Thanks guys

Sean

[egaParticipant @ega]

Posted by Michael Gilligan on 18/11/2018 08:56:40:

This is probably as good as it gets: **LINK**

http://www.silver-steel.co.uk/aboutsilversteel.php

MichaelG.

Good link.

One gotcha used to be that the SS was "tri-lobate" so that out of roundness could not be detected with a mic.

[Michael GilliganParticipant @michaelgilligan61133]

Posted by ega on 18/11/2018 09:26:57:

One gotcha used to be that the SS was "tri-lobate" so that out of roundness could not be detected with a mic.

.

… as mentioned here: **LINK**

https://www.model-engineer.co.uk/forums/postings.asp?th=57958

[JasonBModerator @jasonb]

Don't forget the size of your hole will affect the "fit" just as much as the pin, most off the self reamers are H7 or H8 so your SS will be a sliding fit, you really want it a bit tighter for a dowel pin.

I did have a feeling that proper dowel pins were slightly plus on size.

 

EDIT, seems I remembered correctly they are plus size as per this maker

Edited By JasonB on 18/11/2018 10:19:11

[egaParticipant @ega]

Posted by Michael Gilligan on 18/11/2018 09:37:43:

Posted by ega on 18/11/2018 09:26:57:

One gotcha used to be that the SS was "tri-lobate" so that out of roundness could not be detected with a mic.

.

… as mentioned here: **LINK**

https://www.model-engineer.co.uk/forums/postings.asp?th=57958

Thanks. It had not occurred to me that PGMS might be prone to the same fault; presumably, they are both centreless ground.

[Nick WheelerParticipant @nickwheeler]

Posted by JasonB on 18/11/2018 10:08:22:

Don't forget the size of your hole will affect the "fit" just as much as the pin, most off the self reamers are H7 or H8 so your SS will be a sliding fit, you really want it a bit tighter for a dowel pin.

I did have a feeling that proper dowel pins were slightly plus on size.

Don't you want a very light press fit on one part, and sliding fit on the part you're going to remove(cylinder head for example)?

[Michael GilliganParticipant @michaelgilligan61133]

Posted by ega on 18/11/2018 11:19:44:

Posted by Michael Gilligan on 18/11/2018 09:37:43:

Posted by ega on 18/11/2018 09:26:57:

One gotcha used to be that the SS was "tri-lobate" so that out of roundness could not be detected with a mic.

.

… as mentioned here: **LINK**

https://www.model-engineer.co.uk/forums/postings.asp?th=57958

Thanks. It had not occurred to me that PGMS might be prone to the same fault; presumably, they are both centreless ground.

.

Sorry if my attempt at clarity failed … In that previous thread I was actually trying to distinguish between Silver Steel being 'centreless ground' and PGMS being 'precision ground' [i.e. implicitly … ground between centres]

MichaelG.

[HopperParticipant @hopper]

The ground stainless steel round bars out of old computer printers make pretty handy dowel pins. Otherwise I just use silver steel and a worn reamer that gives a nice firm fit.

Edited By Hopper on 18/11/2018 12:15:01

[egaParticipant @ega]

Posted by Michael Gilligan on 18/11/2018 11:33:14:

Posted by ega on 18/11/2018 11:19:44:

Posted by Michael Gilligan on 18/11/2018 09:37:43:

Posted by ega on 18/11/2018 09:26:57:

One gotcha used to be that the SS was "tri-lobate" so that out of roundness could not be detected with a mic.

.

… as mentioned here: **LINK**

https://www.model-engineer.co.uk/forums/postings.asp?th=57958

Thanks. It had not occurred to me that PGMS might be prone to the same fault; presumably, they are both centreless ground.

.

Sorry if my attempt at clarity failed … In that previous thread I was actually trying to distinguish between Silver Steel being 'centreless ground' and PGMS being 'precision ground' [i.e. implicitly … ground between centres]

MichaelG.

Thanks again. I didn't read the rest of the thread; hence, probably, my misunderstanding.

I don't suppose a small amount of "lobacity" would necessarily prejudice use as a dowel pin.

[lfoggyParticipant @lfoggy]

In my experience silver steel can be surprisingly variable in diameter, roundness and parallelism. 10mm diameter silver steel for example can be anything from 9.97 to 10.00mm.

Silver steel is not that uniform a product. In find precision ground mild steel bar to be better if you need consistency. Wideley available….

[I.M. OUTAHEREParticipant @i-m-outahere]

Posted by Nicholas Wheeler 1 on 18/11/2018 11:28:39:

Posted by JasonB on 18/11/2018 10:08:22:

Don't forget the size of your hole will affect the "fit" just as much as the pin, most off the self reamers are H7 or H8 so your SS will be a sliding fit, you really want it a bit tighter for a dowel pin.

I did have a feeling that proper dowel pins were slightly plus on size.

Don't you want a very light press fit on one part, and sliding fit on the part you're going to remove(cylinder head for example)?

I have an under and over reamer set for this , two reamers per size – .001”over and one .001” under so you get a drive in fit on one side and a sliding fit on the other .

[Author]

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